An evaluation of the survival of Atlantic salmon (Salmo salar L.)fry stocked in eight streams in the North West of England.
Eight streams from the North West of England were stocked with Atlantic salmon (Salmo salar L.) fed fry at densities ranging from 1 to 4/m2 over a period of up to three years to evaluate survival to the end of the first an d second growing periods and hence assess the value of stocking as a manageme...
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National Rivers Authority North West
1995
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ftaquaticcommons:oai:generic.eprints.org:8083 2023-05-15T15:32:04+02:00 An evaluation of the survival of Atlantic salmon (Salmo salar L.)fry stocked in eight streams in the North West of England. Farooqi, M.A. Aprahamian, M.W. 1995-07 application/pdf http://aquaticcommons.org/8083/ http://aquaticcommons.org/8083/1/135_Farooqi.pdf en eng National Rivers Authority North West http://aquaticcommons.org/8083/1/135_Farooqi.pdf Farooqi, M.A. and Aprahamian, M.W. (1995) An evaluation of the survival of Atlantic salmon (Salmo salar L.)fry stocked in eight streams in the North West of England. Warrington, UK, National Rivers Authority North West, 27pp. (NRA/NW/FTR/95/8). Ecology Fisheries Limnology Monograph or Serial Issue NonPeerReviewed 1995 ftaquaticcommons 2020-02-27T09:22:49Z Eight streams from the North West of England were stocked with Atlantic salmon (Salmo salar L.) fed fry at densities ranging from 1 to 4/m2 over a period of up to three years to evaluate survival to the end of the first an d second growing periods and hence assess the value of stocking as a management practice. Survival to the end of the first growin g period (mean duration of 108 days) was found to vary between 7.8 and 41.3% with a mean of 22% and CV of 0.44. Survival from the end of the first growing period to the end of the second growing period (mean duration of 384 days) ranged from 19.9 to 34.1% with a mean of 26.3% and CV of 0.21. Survival was found to be positively related to 0+ trout density (P < 0.05) and negatively related to altitude (P < 0.05). A comparison of the raw survival data (non standardised with respect to duration of experiments) with that from other studies in relation to stocking densities revealed a negative relationship between fry survival and stocking density (P < 0.05). Densities in excess of 5/m2 tended to result in lower levels of survival. Post stocking fry dispersal patterns were examined for the 1991 data. On average 86.7% of the number of fry surviving remained within the stocked zone by the end of the first growing period. With the exception of one stream there was little in the way of dispersal beyond the stocked zone. The dispersal pattern approximated to the normal distribution (P < 0.05). It was estimated that stocking can result in a net gain of fish to a river system compared with natural productivity, however the numerical significance of this gain and its cost effectiveness need to be determined on a river specific basis. Book Atlantic salmon Salmo salar International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons |
institution |
Open Polar |
collection |
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons |
op_collection_id |
ftaquaticcommons |
language |
English |
topic |
Ecology Fisheries Limnology |
spellingShingle |
Ecology Fisheries Limnology Farooqi, M.A. Aprahamian, M.W. An evaluation of the survival of Atlantic salmon (Salmo salar L.)fry stocked in eight streams in the North West of England. |
topic_facet |
Ecology Fisheries Limnology |
description |
Eight streams from the North West of England were stocked with Atlantic salmon (Salmo salar L.) fed fry at densities ranging from 1 to 4/m2 over a period of up to three years to evaluate survival to the end of the first an d second growing periods and hence assess the value of stocking as a management practice. Survival to the end of the first growin g period (mean duration of 108 days) was found to vary between 7.8 and 41.3% with a mean of 22% and CV of 0.44. Survival from the end of the first growing period to the end of the second growing period (mean duration of 384 days) ranged from 19.9 to 34.1% with a mean of 26.3% and CV of 0.21. Survival was found to be positively related to 0+ trout density (P < 0.05) and negatively related to altitude (P < 0.05). A comparison of the raw survival data (non standardised with respect to duration of experiments) with that from other studies in relation to stocking densities revealed a negative relationship between fry survival and stocking density (P < 0.05). Densities in excess of 5/m2 tended to result in lower levels of survival. Post stocking fry dispersal patterns were examined for the 1991 data. On average 86.7% of the number of fry surviving remained within the stocked zone by the end of the first growing period. With the exception of one stream there was little in the way of dispersal beyond the stocked zone. The dispersal pattern approximated to the normal distribution (P < 0.05). It was estimated that stocking can result in a net gain of fish to a river system compared with natural productivity, however the numerical significance of this gain and its cost effectiveness need to be determined on a river specific basis. |
format |
Book |
author |
Farooqi, M.A. Aprahamian, M.W. |
author_facet |
Farooqi, M.A. Aprahamian, M.W. |
author_sort |
Farooqi, M.A. |
title |
An evaluation of the survival of Atlantic salmon (Salmo salar L.)fry stocked in eight streams in the North West of England. |
title_short |
An evaluation of the survival of Atlantic salmon (Salmo salar L.)fry stocked in eight streams in the North West of England. |
title_full |
An evaluation of the survival of Atlantic salmon (Salmo salar L.)fry stocked in eight streams in the North West of England. |
title_fullStr |
An evaluation of the survival of Atlantic salmon (Salmo salar L.)fry stocked in eight streams in the North West of England. |
title_full_unstemmed |
An evaluation of the survival of Atlantic salmon (Salmo salar L.)fry stocked in eight streams in the North West of England. |
title_sort |
evaluation of the survival of atlantic salmon (salmo salar l.)fry stocked in eight streams in the north west of england. |
publisher |
National Rivers Authority North West |
publishDate |
1995 |
url |
http://aquaticcommons.org/8083/ http://aquaticcommons.org/8083/1/135_Farooqi.pdf |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
http://aquaticcommons.org/8083/1/135_Farooqi.pdf Farooqi, M.A. and Aprahamian, M.W. (1995) An evaluation of the survival of Atlantic salmon (Salmo salar L.)fry stocked in eight streams in the North West of England. Warrington, UK, National Rivers Authority North West, 27pp. (NRA/NW/FTR/95/8). |
_version_ |
1766362567366672384 |